I don't like plastic ponchos, but I have a nylon poncho that I use all the time. It breathes better than plastic, so it's more comfortable. I use it alone for light to moderate rain, and if the rain is really heavy (as we know it can be sometimes) I supplement with a compact umbrella. I can also run the nylon poncho through the washing machine. I just get waterproofing spray and give the hood and shoulder area a light spray when it comes out of the dryer and it's good for another year. Check out travel supply companies online, like Magellans, to see different types of travel rain gear.
Personally, I think a rain jacket is just too warm to wear in Florida most of the year. I have one that I can wear in the winter, a nylon unlined one, but if the temps are much above 50 I just start sweating too much. I prefer the air flow I get with the poncho.